How do I open a directory through the command line

Hi!
What I want is /tmp
I can get there in the terminal by typing cd /tmp but what I want is to open that folder and view the files through the file manager, not through the terminal, not through "ls"

You know what would be great? if i could type the exact address of where I wanted to go in a bar at the top of the file manager itself. But for some crazy reason best known to whoever designed it that's not an option. Is there a way to put an address bar there?